/*
 * Copyright 2002-2012 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.beans;

import org.springframework.core.NestedRuntimeException;
import org.springframework.util.ObjectUtils;

/**
 * Abstract superclass for all exceptions thrown in the beans package
 * and subpackages.
 *
 * <p>Note that this is a runtime (unchecked) exception. Beans exceptions
 * are usually fatal; there is no reason for them to be checked.
 *
 * 在所有的beans包和子包中抛出的异常类的抽象父类
 * Beans异常通常都是严重错误
 * 因此没有理由让他们成为受检异常，成为运行时异常即可
 *
 * @author Rod Johnson
 * @author Juergen Hoeller
 */
@SuppressWarnings("serial")
public abstract class BeansException extends NestedRuntimeException {

    /**
     * Create a new BeansException with the specified message.
     *
     * 构造方法
     *
     * @param msg the detail message
     */
    public BeansException(String msg) {
        super(msg);
    }

    /**
     * Create a new BeansException with the specified message
     * and root cause.
     *
     * 构造方法
     *
     * @param msg the detail message
     * @param cause the root cause
     */
    public BeansException(String msg, Throwable cause) {
        super(msg, cause);
    }


    @Override
    public boolean equals(Object other) {
        if (this == other) {
            return true;
        }
        if (!(other instanceof BeansException)) {
            return false;
        }
        BeansException otherBe = (BeansException) other;
        return (getMessage().equals(otherBe.getMessage()) &&
                ObjectUtils.nullSafeEquals(getCause(), otherBe.getCause()));
    }

    @Override
    public int hashCode() {
        return getMessage().hashCode();
    }

}
